>No, the so-called races arose as a result of isolation and the lack of
gene exchange with bees from other regions.

Pete, few races are completely physically isolated from any other.  A
single drone flying from one population's area to another effects gene
transfer.  I suggest that you reread the genetic studies on races of bees.
Every carefully-performed study that I've read demonstrates a continuum of
gene transfer from one race to the next.

-- 
Randy Oliver
Grass Valley, CA
www.ScientificBeekeeping.com

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